<!DOCTYPE html>
<html lang="en">

<head>
  <meta charset="UTF-8">
  <meta http-equiv="X-UA-Compatible" content="IE=edge">
  <meta name="viewport" content="width=device-width, initial-scale=1.0">
  <title>Document</title>
</head>

<body>
  <script>
    let obj = {
      sing: function () {
        console.log('i can sing and play basketball');
      },
      name: '小黑子',
      age: 18,
      gender: '男'
    }
    console.log(obj.name);
    // 必须加中括号和''
    console.log(obj['name']);
    console.log(obj);
  </script>
</body>

</html>